what type of terrain do you ride? their is always a pipe to suit your riding style. for trails: dmc's, paul turner mids, fattys. dunes: toomeys, rockets, shearers, paul turner high revs. fattys are more of an all around pipe, good low end and torque for the trails, while still having that top end in the dunes. the ultimate low end pipes are PT mids, best on the market, but for a high price. im not sure on pro circuits, or ct exhaust, but i hear PC's are pretty good mid-top pipe.